// 链接数据库
const mongoose = require('mongoose');
module.exports = new Promise((resolve,reject)=>{
    mongoose.connect('mongodb://localhost:27017/ssf',{useNewUrlParser:true,useUnifiedTopology:true});
    mongoose.connection.once('open',err=>{
        if(!err)console.log('数据库连接成功');
        else console.log(err);
    })
})